CN102581636A - Boring die for machining engine bodies and boring die support - Google Patents
Boring die for machining engine bodies and boring die support Download PDFInfo
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- CN102581636A CN102581636A CN2012100643257A CN201210064325A CN102581636A CN 102581636 A CN102581636 A CN 102581636A CN 2012100643257 A CN2012100643257 A CN 2012100643257A CN 201210064325 A CN201210064325 A CN 201210064325A CN 102581636 A CN102581636 A CN 102581636A
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Abstract
The invention discloses a boring die for machining engine bodies and a boring die support. A first spindle hole (211) and a first cam shaft hole (221) are arranged on the boring die support (2), the first cam shaft hole (221) is disposed on the upper side of the inside of the first spindle hole (211), the boring die support (2) consists of a first portion (21) and a second portion (22) which can be adjusted and positioned independently, the first spindle hole (211) is arranged on the first portion (21), and the first cam shaft hole (221) is disposed on the second portion (22). Compared with an integral boring die support in the prior art, the boring die support with the structure has the advantages that positioning precision of the first spindle hole and the first cam shaft hole can be improved, furthermore, machining precision of a boring bar in a boring process is improved, and an engine body with high precision can be produced. The invention further provides a boring die. The boring die comprises a base and the boring die support, and has corresponding technical advantages.
Description
Technical field
The present invention relates to the machine-building processing technique field, relate in particular to a kind of boring template and boring template support thereof that is used to process engine body.
Background technology
Boring template is called fixture for boring machine again, is mainly used in hole or hole system on machining box, the support class part, and it not only uses on all kinds of boring machines, also can on building-block machine, lathe and radial drilling machine, use.Different according to the arrangement form of boring template support on boring template, can boring template be divided into double base boring template, single supporting boring template and not have supporting boring template three major types.
In the double base boring template the most frequently used be before and after the double base boring templates, front and back double base boring template is mainly used in the through hole or the hole system of processing draw ratio L/D＞1.5, and its machining accuracy is higher.Because the draw ratio L/D of high-power engine reaches 8-16, even bigger, have only the boring template support and the middle stock that adopt elongated boring bar to cooperate a plurality of band high-precision bearings, and each boring template support adjusted repeatedly could satisfy instructions for use.Therefore the double base boring template is widely used in the spindle hole and the camshaft hole of the big-block engine body that processing length is long, the aperture is little before and after.
Please refer to Fig. 1-Fig. 5, Fig. 1 is the structural representation of boring template of the prior art; Fig. 2 is the side view of the boring template support of boring template shown in Figure 1, and Fig. 3 is respectively among Fig. 2 F-F to cutaway view; Fig. 4 and Fig. 5 are respectively the left view and the front view of the camshaft stock of boring template shown in Figure 1.
In the prior art, as shown in Figure 1, the front and back double base boring template that is used to process engine body generally includes base 1, is located at two boring template supports 2 of base 1 rear and front end, and is located at two main shaft stocks 4 and camshaft stocks 3 between the boring template support 2.In the course of work, realize making boring bar carry out the higher bore hole operation of precision to engine body to the location of the boring bar of boring machine through adjusting two boring template supports 2, main shaft stock 4 and camshaft stock 3.
Yet the boring template of said structure in use has following technological deficiency:
At first, as shown in Figures 2 and 3, the boring template support 2 at above-mentioned boring template two ends adopts monolithic construction; Like this in the position fixing process of concrete adjustment first spindle hole 211; Respective change also can take place in the location of first camshaft hole 221, adjusts in the process of first camshaft hole 221, and the location of first spindle hole 211 also respective change can take place; Therefore usually produce the phenomenon of attending to one thing and lose sight of another, directly influence the positioning accuracy of boring template.
Secondly; Like Fig. 4 and shown in Figure 5, the camshaft stock 3 in the middle of above-mentioned two boring template supports 2 comprises casting supporting seat 31 and the framework 32 of being located at supporting seat 31 tops, and this framework 32 is the tin bronze framework; Because the rigidity of tin bronze is relatively poor; Therefore framework 32 occurs when bolt connects connecing distortion easily, and impaired because of colliding easily in locating adjustment process, influences the adjustment precision and the service life of boring template.
At last, as shown in Figure 1, above-mentioned boring template comprises two main shaft stocks 4 and two camshaft stocks 3, and this makes that the draw ratio of boring bar segmentation is bigger, causes the positioning difficulty of boring bar bigger, can't guarantee the required precision of the engine body that draw ratio is bigger.
In view of this, demand urgently to above-mentioned technical problem, the boring template supporting structure of boring template of the prior art is carried out further optimal design, strengthen the location adjustment precision of boring template support workpiece.
Summary of the invention
The technical problem that the present invention will solve is that a kind of boring template support that is used to process the boring template of engine body is provided, and this boring template boring template support is higher to the location adjustment precision of workpiece.Another technical problem that the present invention will solve is that a kind of boring template that comprises above-mentioned boring template support is provided.
For solving the problems of the technologies described above, the present invention provides a kind of boring template support that is used to process the boring template of engine body, and said boring template support is provided with first spindle hole and first camshaft hole of being located at the said first spindle hole inside front; Said boring template support comprises the first and the second portion of relatively independent adjustment location, and said first spindle hole is located at said first, and said first camshaft hole is located at second portion.
Preferably; Said first and the butt joint of said second portion; The interface of the two comprises horizontal plane and inclined-plane; Said inclined-plane is perpendicular to the line in the said first spindle hole center of circle and the said first camshaft hole center of circle, and said horizontal plane is located at the inboard of said first spindle hole, the below of said first camshaft hole.
Preferably, said inclined-plane is through the mid point of the line in the first spindle hole center of circle and the first camshaft hole center of circle; And horizontal plane is asymmetric horizontal plane about the vertical center line of first camshaft hole; Horizontal plane is located at the inboard of said center line along the long part of inward-outward direction; Short part is located at the outside of said center line, and the outer of short part connects the interior edge on inclined-plane.
Preferably, the interface of said first and said second portion also comprises vertical plane, and the upper edge of said vertical plane, lower edge connect the lower edge on said inclined-plane, the outer of said horizontal plane respectively.
Preferably, said first, said second portion are connected with second screw assembly of screwing downwards through first screw assembly of upwards screwing.
The present invention provides a kind of boring template support that is used to process the boring template of engine body, and it comprises the first and the second portion of relatively independent adjustment location, and first spindle hole is located at first, and first camshaft hole is located at second portion.
Adopt this structure; Because the first and the second portion of boring template support can be adjusted the location relatively independently; Make to position in the adjustment process that when adjusting the position in first spindle hole, the position of being located at first camshaft hole on the second portion can not be affected at boring bar to boring machine; When adjusting the position of first camshaft hole; The spindle hole of being located in the first can not be affected; Adjust promptly that the two can not interfere in the position fixing process, the monoblock type boring template support of the prior art of comparing, this split type boring template support can improve the positioning accuracy to first spindle hole and first camshaft hole; And then strengthened the machining accuracy of boring bar in the bore hole process, to guarantee to produce the higher engine body of precision.
The present invention also provides a kind of boring template that is used to process engine body, comprises base; It is characterized in that also comprise two aforesaid boring template supports, two said boring template supports are located at the rear and front end of said base respectively.
Preferably, said base is connected with the camshaft stock between two said boring template supports, and said camshaft stock comprises supporting seat and the framework that is connected in said supporting seat top, and said framework is the high-carbon steel framework, and said framework is provided with second camshaft hole.
Preferably, the perisporium of said second camshaft hole is copper-plated perisporium.
Preferably, be provided with at least three main shaft stocks and at least three camshaft stocks between two said boring template supports, said main shaft stock all is connected with said base with said camshaft stock.
Preferably, the number of said main shaft stock and said camshaft stock is three.
Because above-mentioned boring template support has above-mentioned technique effect, therefore, comprises that the boring template of this boring template support also should have the corresponding techniques effect, repeats no more at this.
Description of drawings
Fig. 1 is the structural representation of boring template of the prior art;
Fig. 2 is the side view of the boring template support of boring template shown in Figure 1;
Fig. 3 is respectively among Fig. 2 F-F to cutaway view;
Fig. 4 and Fig. 5 are respectively the left view and the front view of the camshaft stock of boring template shown in Figure 1;
Fig. 6 is the structural representation of a kind of specific embodiment of boring template provided by the present invention;
Fig. 7 is a kind of structural representation of the specific embodiment of the boring template support of boring template provided by the present invention;
Fig. 8 is respectively among Fig. 7 F-F to cutaway view;
Fig. 9 and Figure 10 are respectively the left view and the front view of the camshaft stock of boring template shown in Figure 6.
Wherein, Reference numeral among Fig. 1-Figure 10 and the corresponding relation between the component names are:
Base 1;
Camshaft stock 3; Supporting seat 31; Framework 32; Second spindle hole 311; Second camshaft hole 321;
The specific embodiment
Core of the present invention is that a kind of boring template support that is used to process the boring template of engine body is provided, and this boring template boring template support is higher to the location adjustment precision of workpiece.Another core of the present invention is that a kind of boring template that comprises above-mentioned boring template support is provided.
In order to make those skilled in the art understand technical scheme of the present invention better, the present invention is done further detailed description below in conjunction with accompanying drawing and specific embodiment.
Please refer to Fig. 7 to Fig. 8, Fig. 7 is a kind of structural representation of the specific embodiment of the boring template support of boring template provided by the present invention; Fig. 8 is respectively among Fig. 7 F-F to cutaway view.
In a kind of specific embodiment; Shown in Fig. 7-8, the present invention provides a kind of boring template support that is used to process the boring template of engine body, and boring template support 2 is the most important support components of boring template; Be used for the boring bar of boring machine is positioned adjustment; This boring template support 2 is the split-type structural that comprises first 21 and second portion 22, and first 21 is provided with first spindle hole 211, and second portion 22 is provided with first camshaft hole 221; First camshaft hole 221 is positioned at the inside front of first spindle hole 211, and first 21 can relatively independent adjustment location with second portion 22.
Adopt this structure; Because the first 21 and the second portion 22 of boring template support 2 can be adjusted the location relatively independently; Make and position in the adjustment process at boring bar to boring machine; When adjusting the position in first spindle hole 211, the position of being located at first camshaft hole 221 on the second portion 22 can not be affected; When adjusting the position of first camshaft hole 221; The spindle hole of being located in the first 21 211 can not be affected; Adjust promptly that the two can not interfere in the position fixing process, the monoblock type boring template support 2 of the prior art of comparing, this split type boring template support 2 can improve the positioning accuracy to first spindle hole 211 and first camshaft hole 221; And then strengthened the machining accuracy of boring bar in the bore hole process, to guarantee to produce the higher engine body of precision.
In concrete scheme; Like Fig. 7 and Fig. 8; The first 21 of above-mentioned boring template support 2 and second portion 22 butt joints; The interface 23 of the two comprises horizontal plane 231 and inclined-plane 232, and inclined-plane 232 is perpendicular to the line in first spindle hole, 211 centers of circle and first camshaft hole, 221 centers of circle, and horizontal plane 231 is located at the inboard of first spindle hole 211, the below of first camshaft hole 221.
Adopt the boring template support 2 of this structure, can adopt following mode that boring bar is positioned:
At first, realize the accurate location of first spindle hole 211 on X axle and Y axle the position that can pass through the first 21 of adjustment boring template support 2 earlier;
Then, adjust the horizontal level of first camshaft hole 221 in the displacement of X axle, particularly, can adopt second portion 22 is realized the location of camshaft hole on the X axle with respect to the slip of first 21 232 directions on the inclined-plane through adjustment second portion 22.Because the inboard that first camshaft hole 221 is arranged at first spindle hole 211 usually is 45 ° position obliquely; Therefore the butt joint inclined-plane 232 with first 21 and second portion 22 is arranged on the position perpendicular to first spindle hole, 211 centers of circle and first camshaft hole, 221 circle center line connectings; Make in any perpendicular; Inclined-plane 232 is 1 with the slope of oblique line in the coordinate system that is initial point that perpendicular intersects to form with first spindle hole, 211 centers of circle; Be second portion 22 with respect to first 21 in the sliding process of inclined-plane 232 directions; The horizontal coordinate of first spindle hole 221 is with vertically changes in coordinates is identical, makes the adjustment position fixing process of the camshaft hole 221 of winning simple, convenient and accurately.More specifically, the inclined-plane 232 of above-mentioned first 21 and second portion 22 all can adopt the mode of grinding to cooperate, and to increase the fineness on inclined-plane 232, further guarantees the precision of location adjustment.
At last, adjust the height of camshaft hole in the displacement of Y axle through adjustment second portion 22.Particularly, can in the gap of the butt joint horizontal plane 231 of first 21 and second portion 22, adjusting pad be set, when needs increase the height of first camshaft hole 221, change bigger highly slightly adjusting pad; When needs reduce the height of first camshaft hole 221, can realize fine setting through the height that grinding reduces current adjusting pad to first camshaft hole, 221 height.
Can find out that by the above-mentioned course of work what the split type boring template support 2 that adopts above-mentioned whole truncation, part to cut sth. askew can be realized first spindle hole 211 and first camshaft hole 221 adjusts the location relatively independently, has improved the positioning accuracy of boring template support 2 greatly.
In addition; Because above-mentioned first camshaft hole 221 is located at the inside front of first spindle hole 211; And boring template support 2 is provided with base bearing in the inboard of first spindle hole 211; Therefore with horizontal plane 231 be located at the inboard of first spindle hole 211, the below of first camshaft hole 221 has also taken into full account the needs of space layout, make split type boring template support 2 can guarantee to first spindle hole 211 and first camshaft hole 221 locate adjustment relatively independently, local motion is flexible as much as possible again.
Need to prove; More than describe in detail with the course of work of the boring template support 2 of second portion 22 butt joints to first 21; In fact; Above-mentioned boring template support 2 is not limited in the first 21 and second portion 22 that comprises butt joint, and the two also can adopt other connected modes of non-butt joint.
More specifically; Above-mentioned inclined-plane 232 can be through the mid point of the line in first spindle hole, 211 centers of circle and first camshaft hole, 221 centers of circle; And horizontal plane 231 is asymmetric horizontal plane about the vertical center line of first camshaft hole 221; Be located at the inboard of center line along the long part of inward-outward direction, short part is located at the outside of center line, and the outer of short part connects the interior edge on inclined-plane 232.
Adopt this structure, above-mentioned inclined-plane 232 makes in the adjustment process of location through the mid point boring template support of two hole circle heart lines, the stressed equilibrium more of first 21 and second portion 22, and it is more steady to move; In addition; Short part connects the both sides that integral body that inclined-plane 232 makes interface 32 is symmetrically set in the vertical center line of first camshaft hole 221 as far as possible in the horizontal plane 231; Reduce first 21 and the vibrations that second portion 22 produces in the adjustment process of location, further guaranteed the precision of boring template support adjustment.
Need to prove that the noun of locality that occurs among this paper " preceding ", " back " refer to respectively among Fig. 1 and Fig. 6 from left to right, direction from right to left; The noun of locality " interior ", " outward " refer to respectively among Fig. 2 and Fig. 7 from left to right, direction from right to left; The direction of extending about " X axle ", " Y axle " refer among Fig. 2 and Fig. 7 respectively, on the direction that extends below; Should be appreciated that these nouns of locality are that benchmark is set up with the Figure of description, their appearance should not influence protection scope of the present invention.
In scheme further, the first 21 of above-mentioned boring template support 2 and the interface 23 of second portion 22 can also comprise vertical plane 233, and the upper edge of vertical plane 233, lower edge connect the lower edge on inclined-plane 232, the outer of horizontal plane 231 respectively.
Adopt this structure; When making the vertical height of adjustment second portion 22; Can be specifically through second portion 22 be upwards slided along perpendicular; For the position of vertically adjusting first camshaft hole 221 provides certain guide effect, the X shaft position of avoiding having adjusted changes again, further guarantees the positioning accuracy of first camshaft hole 221.
The first 21 of above-mentioned split type boring template support 2 and the concrete connected mode of second portion 22 can also further be set.
In the concrete scheme, as shown in Figure 8, above-mentioned first 21, second portion 22 are connected with second screw assembly 25 of screwing downwards through first screw assembly 24 of upwards screwing.The screw assembly of screwing through two groups of rightabouts connects first 21 and second portion 22, can make boring template support 2 have better intensity, further guarantees the positional accuracy of 2 pairs of spindle holes of boring template support and camshaft hole.Certainly, above-mentioned first 21 can also adopt other modes to be fixedly connected with second portion 22.
Please refer to Fig. 6, Fig. 6 is the structural representation of a kind of specific embodiment of the boring template that is used to process engine body provided by the present invention.
As shown in Figure 6, the present invention also provides a kind of boring template that is used to process engine body, comprises base 1; Comprise that also 2, two boring template supports 2 of two aforesaid boring template supports are located at the rear and front end of base 1 respectively.
Because above-mentioned boring template support 2 has above-mentioned technique effect, therefore, comprises that the boring template of this boring template support 2 also should have aforesaid technique effect, repeats no more at this.
Please refer to Fig. 9 and Figure 10, Fig. 9 and Figure 10 are respectively the left view and the front view of the camshaft stock of boring template shown in Figure 6.
Other specific constructive form of above-mentioned boring template can also further be set.
In the another kind of specific embodiment; Because the main shaft of engine and the draw ratio of camshaft are bigger; Therefore above-mentioned boring template can also be provided with main shaft stock 4 and camshaft stock 3 between two boring template supports 2, is respectively applied for further support boring bar, guarantees the boring bar accurate positioning.Camshaft stock 3 comprises supporting seat 31 and the framework 32 that is connected in supporting seat 31 tops, and this framework 32 can be the high-carbon steel framework, and supporting seat 31 is provided with second spindle hole 311, and high-carbon steel framework 32 is provided with second camshaft hole 321.
Adopt this structure; Because high-carbon steel has bigger strength and stiffness; Therefore this framework 32 has rigidity and bigger, the on-deformable characteristics of intensity in the adjustment position fixing process to second camshaft hole 321, has improved the accuracy to second camshaft hole, 321 adjustment location.Particularly, can adopt the main material of 65Mn high-carbon steel material as framework 32, certainly, above-mentioned high-carbon steel framework can also adopt the high-carbon steel of other materials.
In the scheme, the perisporium of second camshaft hole 321 of above-mentioned high-carbon steel framework is copper-plated perisporium more specifically.
Adopt this structure; Because having, copper dissolves oiliness preferably; Therefore, after the bigger camshaft stock 3 of rigidity and intensity was realized the integral body location adjustment to camshaft hole, the copper facing perisporium of second camshaft hole 321 can be avoided the dry friction of camshaft stock 3 and boring bar; Reduce the wearing and tearing of camshaft stock 3 and boring bar, further improved the job stability of camshaft stock 3.
The main shaft stock 4 of above-mentioned boring template and the concrete number of camshaft stock 3 can also further be set.
In the another kind of specific embodiment, as shown in Figure 6, be provided with at least three main shaft stocks 4 between two boring template supports 2 of above-mentioned boring template, main shaft stock 4 is provided with the 3rd spindle hole 41 that is used to locate boring bar.Above-mentioned boring template also comprises at least three camshaft stocks 3, and main shaft stock 4 all is connected with base 1 with camshaft stock 3.
Adopt this structure; Quantity through suitable increase main shaft stock 4 and camshaft stock 3; Reduced the draw ratio of each boring bar segmentation; The boring template that only comprises two main shaft stocks 4 and two camshaft stocks 3 in the prior art of comparing has increased spindle hole location and camshaft hole locating accuracy, has further guaranteed the precision of boring machine processing.
Particularly, the number of above-mentioned main shaft stock 4 and camshaft stock 3 is three.Because the quantity of main shaft stock 4 and camshaft stock 3 is many more, the location adjustment process of spindle hole and camshaft hole is more complicated, therefore, when being purpose increase main shaft stock 4 and camshaft stock 3 to improve positioning accuracy, will consider to locate the operability of adjustment simultaneously.Choose the main shaft stock 4 and camshaft stock 3 of three of numbers, compare with the boring template of two camshaft stocks 3, improved the location adjustment precision of boring template support 2 greatly with only comprising two main shaft stocks 4; With comprise four or more the main shaft stock 4 of more number compare with the boring template of camshaft stock 3, make the location adjustment process of spindle hole and camshaft hole and uncomplicated, have stronger operability.
Certainly, above-mentioned boring template is not limited in and comprises three main shaft stocks 4 and three camshaft stocks 3, can also comprise the main shaft stock 4 and camshaft stock 3 of other numbers.
More than a kind of boring template and boring template support thereof that is used to process engine body provided by the present invention carried out detailed introduction.Used concrete example among this paper principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (10)
1. boring template support that is used to process the boring template of engine body, said boring template support (2) is provided with first spindle hole (211) and is located at first camshaft hole (221) of said first spindle hole (211) inside front; It is characterized in that said boring template support (2) comprises the first (21) and the second portion (22) of relatively independent adjustment location, said first spindle hole (211) is located at said first (21), and said first camshaft hole (221) is located at second portion (22).
2. the boring template support that is used to process the boring template of engine body according to claim 1; It is characterized in that; Said first (21) and said second portion (22) butt joint; The interface of the two (23) comprises horizontal plane (231) and inclined-plane (232); Said inclined-plane (232) is perpendicular to the line in said first spindle hole (211) center of circle and said first camshaft hole (221) center of circle, and said horizontal plane (231) is located at the inboard of said first spindle hole (211), the below of said first camshaft hole (221).
3. the boring template support that is used to process the boring template of engine body according to claim 2 is characterized in that said inclined-plane (232) are through the mid point of the line in first spindle hole (211) center of circle and first camshaft hole (221) center of circle; And horizontal plane (231) is asymmetric horizontal plane (232) about the vertical center line of first camshaft hole (221); Horizontal plane (231) is located at the inboard of said center line along the long part of inward-outward direction; Short part is located at the outside of said center line, and the outer of short part connects the interior edge on inclined-plane (232).
4. the boring template support that is used to process the boring template of engine body according to claim 3; It is characterized in that; The interface (23) of said first (21) and said second portion (22) also comprises vertical plane (233), and the upper edge of said vertical plane (233), lower edge connect the outer of the lower edge of said inclined-plane (232), said horizontal plane (231) respectively.
5. according to each described boring template support that is used to process the boring template of engine body of claim 1-4; It is characterized in that said first (21), said second portion (22) are connected with second screw assembly (25) of screwing through first screw assembly (24) of upwards screwing downwards.
6. a boring template that is used to process engine body comprises base (1); It is characterized in that also comprise two like each described boring template support (2) of claim 1-5, two said boring template supports (2) are located at the rear and front end of said base (1) respectively.
7. the boring template that is used to process engine body according to claim 6; It is characterized in that; Said base (1) is connected with camshaft stock (3) between two said boring template supports (2); Said camshaft stock (3) comprises supporting seat (31) and is connected in the framework (32) of said supporting seat (31) top, and said framework (32) is the high-carbon steel framework, and said framework (32) is provided with second camshaft hole (321).
8. the boring template that is used to process engine body according to claim 7 is characterized in that, the perisporium of said second camshaft hole (321) is copper-plated perisporium.
9. according to each described boring template that is used to process engine body of claim 6-8; It is characterized in that; Be provided with at least three main shaft stocks (4) and at least three camshaft stocks (3) between two said boring template supports (2), said main shaft stock (4) all is connected with said base (1) with said camshaft stock (3).
10. the boring template that is used to process engine body according to claim 9 is characterized in that, the number of said main shaft stock (4) and said camshaft stock (3) is three.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210064325.7A CN102581636B (en) | 2012-03-12 | 2012-03-12 | Boring die for machining engine bodies and boring die support |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210064325.7A CN102581636B (en) | 2012-03-12 | 2012-03-12 | Boring die for machining engine bodies and boring die support |
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| Publication Number | Publication Date |
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| CN102581636A true CN102581636A (en) | 2012-07-18 |
| CN102581636B CN102581636B (en) | 2014-12-10 |
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| CN201210064325.7A Expired - Fee Related CN102581636B (en) | 2012-03-12 | 2012-03-12 | Boring die for machining engine bodies and boring die support |
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| CN104972324A (en) * | 2015-06-18 | 2015-10-14 | 潘秀娟 | Boring mold fixture for machining outrigger part |
| CN114054808A (en) * | 2021-12-27 | 2022-02-18 | 黄秀芳 | Special equipment structure for machining high-precision frame of reciprocating pump |
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| Publication number | Publication date |
|---|---|
| CN102581636B (en) | 2014-12-10 |
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